Performance deterioration of p-type single crystalline silicon solar modules affected by potential induced degradation in photovoltaic power plant

Fig. 7 gives out the distribution of the maximum output power for three substrings in one module from module 1 to 17 under STC. From Fig. 7, we found that the maximum power of three substrings in one module from No. 1 to No. 9 under STC is nearly the same after one year's operation, and that the degradation degree of maximum power for three substrings in one module from No. 10 to No. 17 under STC is different. The closer to the negative pole of module string the substring is, the more the degradation of maximum power for three substrings in one module is.176